Television tube shield



Feb. 25, 1958 J. B. SEEVER' 2,825,051

TELEVISION TUBE summ- Filed April 29, 1954 2 Sheets-Sheet 1 a FIG. 3A

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INVENTOR. JOHN B. SEEVER ATTORNEYS Feb. 25, 1958 J. B. SEEVER TELEVISION TUBE snmm 2 Sheets-Sheet 2 Filed April 29, 1954 Fla 8 FIG. l'l

w i a INVENTOR. JOHN B. SEEVER ATTORNEYS United States Patent ce 2,825,051 TELEVISION TUBE SHIELD John B. Seever, Chicago, Ill., assignor to Cortland Industries, Inc., Chicago, 111., a corporation of Illinois Application April 29, 1954, Serial No. 426,524 4 Claims. (Cl. 340-367) This invention relates to shielding devices and more particularly to an arrangement which will enclose and protect'the end of the cathode ray tube of a television receiving set projected beyond the wall of the cabinet in which the tube is housed.

It has been found to be advantageous to extend one end of the cathode tube of a television receiving set through the rear wall of the cabinet in which the tube is mounted because this enables the utilization of a cabinet of restricted depth from the front to the rear thereof. Moreover, by projecting such a tube beyond the rear wall of the cabinet, it is possible to prevent the cabinet being placed tightly against an adjacent wall in such a Way as might impair dissipation of heat from the cabinet. When the end of the cathode ray tube is extended in the above described manner, it is of course necessary to protect the same and to this end resort has been had to shields of several different kinds for enclosing the projecting end of such tubes and which are secured in different manners to the rear wall of the cabinet in which the tube is housed. It is desirable that such shields be securely retained on the rear wall of the cabinet against displacement, because otherwise there is no assurance that the shield will adequately serve the intended purpose, and, moreover, voltages applied to the cathode ray tube are relatively high such that inadvertent displacement of the shield relative to the television cabinet represents a hazard.

In view of the foregoing, a primary object of the present invention is to so construct a shield of the foregoing kind as to assure that this shield, when mounted about the projecting end of the cathode ray tube, is retained securely against inadvertent displacement both axially and circumferentially, and a further object is to permit this to be achieved in such a manner that the shield is not encumbered with locking attachments that are visible when the shield is located in properly mounted position.

Specifically, it is an object of the present invention to enable a shield of the foregoing kind to be securely locked in position on the television cabinet by means of a rim on the shield and ears spaced therefrom so as to grip between them portions of the opposite sides of the wall of the cabinet on which the shield is mounted, and to inexpensively achieve this construction.

As shielding devices have been heretofore constructed, it has been necessary to mount the shield on the cabinet wall from the inside out, whereas it is desirable that the shield be capable of being mounted and dismounted from the outside. A further object of the present invention is to enable this desired relation'to be achieved in a shield that includes the two way locking feature of the present invention as set forth above.

Other and further objects of the present invention are to afford a shield of the aforesaid character which may be readily fabricated from inexpensive material and assembled without difficulty; to assure that the shield may be firmly attached to the rear wall of the television cabinet against displacementeither in an axial or circumferential 2,825,051 Patented Feb. 25, 1958 direction; and to permit the aforementioned locking relation of the shield on the cabinet to be achieved quickly without the necessity of any manipulations other than motion imparted to the shield itself during the course of mounting the same on the television cabinet.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show preferred embodiments of the present invention and the principles thereof and what I now consider to be the best mode in which I have contemplated applying these principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention.

In the drawings: 7

Fig. l is a perspective view of a television cabinet and rear wall thereof having a shield of the present inventicn mounted thereon;

Fig. 2 is a rear elevation of the wall shown in Fig. 1 with the shield thereon removed;

Fig. 3 is a view from the inside of the cabinet looking outwardly into the cavity afforded by the shield of the present invention disposed on the rear wall of the cabinet;

Fig. 3A is a view similar to Fig. 3 showing the shield rotated substantially through Fig. 4 is a sectional view of the wall on which the shield is mounted taken on the line 4-4 of Fig. 3A showing the shield in side elevation;

Fig. 5 is a rear elevation of the shield by itself;

Figs. 6 and 7 are detail sectional views taken on the lines 6-6 and 7-7, respectively, of Figs. 3 and 3A;

Fig. 8 is an enlarged rear elevation, broken away, of a portion of the outside of the shield shown in Fig. 4 taken on the line 8-8 of Fig. 4;

Fig. 9 is a side elevation of the marginal edge portion of the shield shown in Fig. 8;

Fig. 10 is a front elevation of the side of the shield opposite that shown in Fig. 8;

Fig. 11 is a side elevation similar to Fig. 9 taken from the opposite or inside wall of the shield shown in Fig. 9;

Figs. 12 and 13 are enlarged sectional detail views showing how the shield of the present invention is retained on the television cabinet against circumferential displacement;

Figs. 14 and 15 are enlarged section detail views showing how the shield of the present invention is mounted on the television cabinet against axial displacement; and

Figs. 16 and 16A are views showing a modified form of the invention.

The present invention is illustrated in Figs. 1 to 16 as embodied in a frusto-conical shaped shield 120 that is to be mounted on the wall W of a television cabinet C about the projected end of the cathode ray tube T mounted in the cabinet. The wall W is mounted as by screws to the rear of the cabinet C and a large circular opening 121 is afforded therein through which the end of the tube T projects as can be seen in Fig. 4. As will be described in detail below, the portion of the wall W'.about. the opening 121 is constructed in aparticular manner so as to receive the shield 120.

The shield 120 is in the form of the frustum of a cone and includes a rounded side wall 120SW, Fig. 4, which can be constructed of a single piece of flexible stock material such as heavy cardboard stock or the like. The more narrow end of the shield 120, away from the wall W, is closed, and the opposite or base end is open so as to permit the shield 120 to be mounted on the wall W in enclosing relation about the end of the tube T that is projected through the wall W as can be seen in Fig.- 4.-

3 When thus mounted, the end of the shield 120 which is of reduced diameter is spaced substantially from the end of the tube T, thus assuring that the projected end of the cathode ray tube in the cabinet C is protected against damage.

To thus close off one end of the shield 120, an annular molded cap 124 having a rim 124R tapered in the direction of and complementary to the slope of the side wall 120SW is mounted on the end of the shield 120 away from the wall W, and is held in place as by small rivets R, Fig. 4. This affords a rear wall 1243311 for the shield.

In accordance with the present invention, the shield 120 may be mounted on and removed from the outside of the wall W without the necessity of mounting or dismounting the shield 120 from the inside face of the wall W or from the inside of the cabinet C. This is achieved in the present instance by affording an annular rim at the open end of the shield 120 having ears associated therewih so that a portion of the wall W about the opening 121 therein may be disposed between the rim and the ear to mount the shield securely in position on the wall W. In achieving this relation, a separable molded rim member 125 affording a relatively narrow continuous annular rim 126 is attached to the open end of the shield 120 which is to be disposed on the wall W. This annular rim 126 projects outwardly of the side wall 120S W of the shield 120 as can be seen in Fig. 4 substantially in normal relation thereto and to the longitudinal central axis of the shield, and it will be seen that this permits the shield 120 to be disposed on the outer face of the wall W with the flat forward face of t the rim 126 engaged flush against the wall W as shown in Fig. 4. In mounting the rim member 125 on the shield, a continuous annular flange 126A, Fig. 12, having a diameter and taper complementary to that at the inside of the shield 120 at the open end thereof, is included as an integral part of the rim member 125 such that this flange may be telescoped into the open end of the shield 120 and fastened thereto as by rivets R-2, Figs. 3 and 12.

The attachment of the rim member 125 to the open end of the shield 120 in this manner is facilitated by folding the flange 126A back upon itself as at 1268, Fig. 12, adjacent the free edge of the shield 121} to afford a continuous annular cavity 126C which extends about the rim member between the flanges 126A and 1268, and the relation is such that the peripheral marginal edge portion at the open end of the shield 120 may be inserted into the cavity 126C during the course of mounting the rim member 126 on the shield to assure a positive interfit of the connected parts.

In providing a rim 126 of the above kind extended radially outwardly of the side wall 120SW so as to engage against the outer face of the wall W, the flange 126$ affording the annular cavity 126C is also folded back upon itself as at 126L, and the rim 126 is then disposed in normal relation to the flanges 126L, 1268 and 126A as shown in Figs. 12 and 13. Such reverse folding of the flange 1268 provides a hollow annular rib 126R at the opening end of the cavity 126C extending back over the marginal edge portion of the side wall 12SW at the open end of the shield 120 as can be seen in Fig. 4, and pressed out of that portion of the rim member 126 which affords the rim 126 as above described is a segmental lug or rib 126R2 provided for a purpose that will be described hereinbelow. A plurality of such lugs 126R2 are preferably afforded and in the present instance these are three in number as can be seen in Figs. 3 and 3A. In providing the ribs 126R2, depressions 126D are formed at corresponding locations about the rim 126 as can be seen in Fig. which is a plan view looking from the rear of the shield 12 in the direction of the open end.

It will be appreciated that the various reverse folds and ribs described above may be readily afforded by a hot stamping operation on a sheet of plastic from which the rim number 125 is to be fabricated.

To mount the shield on the rear Wall W of the television cabinet C, ears or lugs attached to the open end of the shield 120 are arranged in a circumferential spaced relation thereabout and are spaced from the rim 126 so as to afford with the rim 126 circumferentially spaced recesses in which portions of the wall W about the opening 121 therein may be disposed. In the present instance, these lugs take the form of projected ears 127' at the open end of the shield 120 stamped out of the rim 126 during the course of the forming operation on the rim member 125 so as to be an integral part thereof. Thus, segment ears 127 are stamped out of the material of the rim member 125 in the portion thereof which lies between the attaching flange 126A and the rim 126. The stamping operation affording the ears 127 leaves openings 129, Figs. 5 and 8, in that portion of the rim memher 125 allocated to the ears 127. Three such ears are afforded in the present instance at 120 intervals about the rim member, and the form of each of these ears is such as to include an arm portion 127A, which is in the plane of the annular flange 126A, and a finger portion 127E at the free end of each arm 127A disposed outwardly of the rim 126 in normal relation to the arm 127A so as to be spaced from but disposed in parallel relation to the inner face of rim 126. To afford an increased degree of yieldability of the ears 127 on the rim member 125, slots may be cut in the flange 126A at either side of the ear 127, and during the course of stamping the ears 127 out from the rim member 125 strengthening ribs 127R are preferably provided which protrude from the inner face of the ears leaving depressions 127D in the outer face thereof as can be seen in Fig. 5

From the foregoing it will be seen that the ears 127 as spaced from the rim 126 provide a plurality of circumferentially spaced recesses between the rim 126 and the fingers 127F about the open end of the shield 120, and it is these recesses which in the present instance erve to permit the shield 120 to be mounted on the rear wall W of the television cabinet C against axial displacement. Thus as shown in Fig. 2, three circumferentially spaced slots 122 are provided about the opening 121 in the wall W in which the projected end of the tube T is disposed, and the spacing between these slots 122 corresponds to the spacing between the ears 127 so that the shield 120 may be placed on the rear face of the wall W with the ears 127 disposed in the slots 122 and the rim 126 engaged flush with the wall W. This initial disposition of the shield 120 on the rear face of the wall W is illustrated in Fig. 14. When thus disposed on the wall W, the shield 120 can be rotated in either direction as viewed in Fig. 3 to rotate the ears 127 past the openings or slots 122, and this is effective to dispose circumferential portions of the wall W intermediate the slots 122 between the rim 126 and the finger portions 127F of the ears 127 to mount the shield 120 to the wall W. Such interengagement between the shield 129 and the wall W prevents the withdrawal of the shield 126 in an axial direction away from the wall W and therefore the shield 120 cannot be dismounted from the wall W until the ears 127 are again disposed in the area of the slots 122.

To prevent rotative movement of the shield 120 relative to the wall W when the shield is mounted thereon as described above, locking protrusions or lugs are formed in circumferentially spaced relation on the rim 127 for engaging in slots provided therefor in the wall W. One way in which this may be accomplished is to resort to the segment ribs as 126R-2 described hereinabove in connection with the construction of the rim member 125 that is secured to the open end of the shield 120. These ribs 126R-2 are located on the rim 126 medially of the lugs 127, and hence three such ribs as 126R-2 are afiorded in the present instance disposed in projecting relation on the inner face of the rim 126 so as to engage the slots 122 during the course of rotating the ears 127 past the slots 122 as described above. Thus, ribs 126R-2 are each of a length equal to the length of the slots 122 and accordingly will drop in to the slots 122 to prevent further rotation of the shield 12% when the ribs 126R-2 are disposed opposite the slots 122. In this manner, the shield 123 may be mounted on the wall W against both circumferential and axial displacement, and to dismount the shield 120 it is necessary to apply a substantial amount of rotary torque force to rotate the ribs 126R-2 out of the slots 122. This assures that the shield 120 is not inadvertently removed from the wall W to expose the end of the tube T.

A modified form of the invention is shown in Figs. 16 and 16A. In this instance, relatively small lugs in the form of buttons as 126K are pressed out of the rim 126 in spaced circumferential relation thereon. The buttons 126K are so disposed on the rim 126 as to be aligned circumferentially with circular openings as 123 that are spaced about the wall W between the slots 122 therein previously described so as to be registerable with the buttons 126K. Accordingly, by mounting the shield 120 on to the wall W by passing the ears 127 through the slots 122 provided therefor and rotating the shield 122 to pass the ears 127 beyond the slots 122, further rotation imparted to the shield 120 brings the buttons 126K in to registry with the openings 123 and the buttons 126K will snap into the latter to hold the shield 120 against further rotation.

From the foregoing, it will be seen that in accordance with the present invention a shield for the projected end of a cathode ray tube is afforded of such nature as to enable the shield to be mounted on to the wall through which the end of the tube projects from the outside thereof, thus making it unnecessary to pass this shield from the inside of the wall out through the opening as 121 in which the projected end of the tube is to be disposed. Moreover, the shield of the present invention is of such nature as to be mounted in the foregoing manner while held securely on the wall against both axial and circumferential displacement, assuring that the shield is not easily dismounted from the cabinet housing the tele vision receiving set.

I claim:

1. A shield adapted to be mounted on one wall of a cabinet for housing a cathode ray tube having the end thereof projected beyond said wall comprising, a hollow housing closed at one end and open at the other, an annular rim formed about the peripheral edge of said housing at the open end with the forwardmost portion thereof disposed in a plane substantially normal to the longitudinal central axis of said housing so as to engage flush against one side of said wall, a plurality of segmental ears formed integrally with said rim at the open end of said housing so as to be spaced opposite said rim to provide with said forwardmost portion of said rim a plurality of radial outwardly opening spaced apart circumferential recesses about the open end of said shield in which portions of said wall may be disposed to mount the shield on said wall against axial displacement, and axially directed projections disposed normal to the planes of said ears and provided on said shield in spaced circumferential relation about said rim and adapted to engage abutments on said cabinet wall to limit rotative displacement of said shield relative to said cabinet wall.

2. A shield adapted to be mounted on one wall of a cabinet for housing a cathode ray tube having the end thereof projected beyond said wall comprising, a hollow housing closed at one end and open at the other, a rim formed about said housing at the open end thereof so as to be disposed in a plane substantially normal to the longitudinal central axis of said housing, segmental ears formed integrally with said rim at the open end of said cabinet housing so as to be spaced opposite said rim and in spaced relation to one another to cooperate with said rim in affording a plurality of spaced apart radial outwardly opening recesses at the end of said shield in which space-d portions of said wall may be disposed to mount the shield on the wall against axial displacement, and ribs carried on the rim between said ears to engage abutments formed in said wall away from the portions thereof disposed as aforesaid to prevent turning of the shield on the wall.

3. in a cabinet of the kind described, a wall having an opening provided therein through which the end portion of a cathode ray tube may be projected, a shield mounted on said wall including a housing having a side wall adapted to be disposed in enclosing relation about the projected end of said tube, the peripheral marginal portion of the shield at the end thereof corresponding to said cabinet wall including an annular continuous rim extended thereabout with the forwardmost portion of the rim being substantially in normal relation to said side wall, spaced segmental ears disposed about said peripheral marginal portion of the shield and spaced forwardly of said rim in an axial direction so as to define with the rim circumferentially spaced radial outwardly opening recesses in which portions of said cabinet wall surrounding said opening provided therein may be disposed to mount the shield on said cabinet wall against axial displacement, and axially directed projections disposed normal to the planes of said ears and provided on said shield in spaced circumferential relation about said rim and engaging related complemental abutments on said cabinet wall to limit rotative movement of said shield relative to said cabinet wall.

4. In a cabinet of the kind described, a wall having an opening provided therein through which the end portion of cathode ray tube may be projected, a shield mounted on said wall including a housing having a side well adapted to be disposed in enclosing relation about the projected end of said tube, the peripheral marginal portion of the shield at the end thereof next to said wall having a rim thereon extended radially outwardly from said side wall substantially in normal relation thereto so as to engage flush against the outside face of said wall, segmental ears disposed about said peripheral marginal portion of the shield and spaced forwardly from said rim in an axial direction so as to define with the rim spaced apart radial outwardly opening recesses in which portions of said cabinet wall surrounding said opening provided therein may be disposed to mount the shield on said cabinet wall against axial displacement, and lugs provided on the face of said rim adjacent said wall of the cabinet for engaging abutments in said wall of the cabinet to hold the shield on said wall against rotative movement.

References Cited in the file of this patent UNITED STATES PATENTS 2,046,184 Seaf June 30, 1936 2,480,692 Anthony Aug. 30, 1942 2,642,566 Regnier June 16, 1953 FOREIGN PATENTS 861,654 Ireland July 30, 1907 

